2021/05/04 by Leo WH Fung, Fung, Leo WH, Lingfeng Li +9 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Scientific Research and Discoveries
paper · pdf · doi:10.48550/arxiv.2105.01631
openalex publication_date 2021/05/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The ΛCDM model provides an excellent fit to the CMB data. However, a statistically significant tension emerges when its determination of the Hubble constant H0 is compared to the local distance-redshift measurements. The axi-Higgs model, which couples an ultralight axion to the Higgs field, offers a specific variation of the ΛCDM model. It relaxes the H0 tension as well as explains the 7Li puzzle in Big-Bang nucleosynthesis, the clustering S8 tension with the weak-lensing data, and the observed isotropic cosmic birefringence in CMB. In this paper, we demonstrate how the H0 and S8 tensions can be relaxed simultaneously, by correlating the axion impacts on the early and late universe. In a benchmark scenario (m=2 × 10-30 eV) selected for experimental tests soon, the analysis combining the CMB+BAO+WL+SN data yields H0 = 69.9 ± 1.5 km/s/Mpc and S8 = 0.8045 ± 0.0096. Combining this (excluding the SN (supernovae) part) with the local distance-redshift measurements yields H0 = 72.42 ± 0.76 km/s/Mpc, while S8 is slightly more suppressed.